Iron Maiden.
A lot of super-elite "metalheads" (most think that labeling yourself is 'gay') have grown out of Opeth, and say that they, quote "bore them to tears". Im not saying this will happen to me, and I think Opeth will always be with me becase of how they spur many poetic qualities within me.
Another band that will remain with me is Emperor. Ihsahn is definately the best BM vocalist. Samoth most easily the best rhythm guitarist. Trym is an excellent drummer. Emperor always has unique and interesting melodies in their music, especially on Anthems. And the poetic quality of their lyrics is astounding.
Arcturus is another band I will always cherish. Sverd is an excellent keyboardist, who incorporates a lot of classical influences into the music. Great guitars, and great bass. Hellhammer is one of the best drummers in existance. And Garm is one of the best vocalists in BM (or he was until he became Trickster-G, or whatever
).
Finally, Borknagar. The Olden Domain with Garm is marvelous, as is The Archaic Course with Vortex. Vortex, to me, is not only one of the best BM vocalists, but also my favorite clean vocalists in BM.In fact, I don't think Borknagar has one bad album.